Revert "Fix "nil is not a valid asset source" error"
Revert "Fix "nil is not a valid asset source" error"

This reverts commit 7917372575c072fe4b30f30b6fe8ab233d610583.

SulphurDioxide/metasmoke,angussidney/metasmoke,j-f1/forked-metasmoke,SulphurDioxide/metasmoke,Charcoal-SE/metasmoke,Charcoal-SE/metasmoke,SulphurDioxide/metasmoke,Charcoal-SE/metasmoke,j-f1/forked-metasmoke,angussidney/metasmoke,angussidney/metasmoke,angussidney/metasmoke,j-f1/forked-metasmoke,j-f1/forked-metasmoke,Charcoal-SE/metasmoke